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Table 1

Methods of estimating household water use and related datasets

Quantification approachData collection toolMethod of estimationProxy dataAdditional dataWater use estimation formulae
Consumption-based Household survey Stated End-Use method Household water use patterns related to potable consumption, hygiene and amenity uses. Water-use coefficients (from literature/ assumptions).  (Detailed note in Supplement.)
Applicability- Source independent thereby accounting for all sources of water accessed.  
Supply-based Household survey Sump Fill method Frequency & duration of water supply, fraction of sump filled during each supply period and stated sump volumetric capacity. (Retrospective average of previous month.)  
This accounts for m sumps in a household.
Applicability- Piped water supply volume stored in the sump(s). Excludes water accessed from sources such as PSPs, tankers and private bore wells. 
Supply-based Water diary Pump Duration method Actual dates and durations of pumping for 2 weeks. Includes pumping from sump(s) to OHTs and bore well to OHT(s)/ sump. Volumetric flow rate estimated from pressure sensor data
OR
Measurements of volumetric flow rate. 

This accounts for p pumps in a household.
Applicability- Water use from piped supply stored in sump(s), private bore wells, PSP water diverted to sump(s). 
Consumption & Supply-based Sensor monit-oring Water Balance method Pressure sensor data in sumps and OHTs for 2 weeks. 
  • (a) Measurement of sump and OHT dimensions to determine volumetric capacity.

  • (b) Actual dates of piped supply, PSP diversion to the sump, bore well pumping (for same time period) from water diary.

 
Consumption/supply was estimated from the Water Balance of sumps and OHTs.


where refers to change in storage.
Applicability-
  • (a) Supply from all sources intercepted by household sump(s) and OHTs.

  • (b) Consumption from the OHTs and sump(s).

 
Quantification approachData collection toolMethod of estimationProxy dataAdditional dataWater use estimation formulae
Consumption-based Household survey Stated End-Use method Household water use patterns related to potable consumption, hygiene and amenity uses. Water-use coefficients (from literature/ assumptions).  (Detailed note in Supplement.)
Applicability- Source independent thereby accounting for all sources of water accessed.  
Supply-based Household survey Sump Fill method Frequency & duration of water supply, fraction of sump filled during each supply period and stated sump volumetric capacity. (Retrospective average of previous month.)  
This accounts for m sumps in a household.
Applicability- Piped water supply volume stored in the sump(s). Excludes water accessed from sources such as PSPs, tankers and private bore wells. 
Supply-based Water diary Pump Duration method Actual dates and durations of pumping for 2 weeks. Includes pumping from sump(s) to OHTs and bore well to OHT(s)/ sump. Volumetric flow rate estimated from pressure sensor data
OR
Measurements of volumetric flow rate. 

This accounts for p pumps in a household.
Applicability- Water use from piped supply stored in sump(s), private bore wells, PSP water diverted to sump(s). 
Consumption & Supply-based Sensor monit-oring Water Balance method Pressure sensor data in sumps and OHTs for 2 weeks. 
  • (a) Measurement of sump and OHT dimensions to determine volumetric capacity.

  • (b) Actual dates of piped supply, PSP diversion to the sump, bore well pumping (for same time period) from water diary.

 
Consumption/supply was estimated from the Water Balance of sumps and OHTs.


where refers to change in storage.
Applicability-
  • (a) Supply from all sources intercepted by household sump(s) and OHTs.

  • (b) Consumption from the OHTs and sump(s).

 
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